From the Department of Psychiatry and Behavioral Neurosciences, University of Chicago, Chicago; the Department of Psychiatry, University of Cambridge, Addenbrooke’s Hospital, Cambridge, U.K.; the Trichotillomania Clinic and Research Unit, Massachusetts General Hospital and Harvard Medical School, Boston; the MRC Unit on Anxiety and Stress Disorders, Department of Psychiatry, University of Stellenbosch, South Africa; and the Department of Psychiatry and Mental Health, University of Cape Town, South Africa.